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The red and blue circles in Fourier space mark the k-values required to couple incoming light into the waveguide modes at the red and blue ends of the solar spectrum, respectively. In comparison, although still containing a periodic component, the pattern on a pre-written Blu-ray movie disc (Fig.

After error-correcting and modulation coding, a quasi-random pattern of pits is eventually generated on the disc, which we found to be surprisingly well suited for photon management over the entire solar spectrum.